Outer Sheath: Diameter 6-25mm, Length 100-1000mm

Component Specifications

Definition

The outer sheath is a critical protective component in cartridge heaters used for casting mold temperature control. It serves as the primary barrier between the internal heating elements and the external environment, providing mechanical protection, electrical insulation, and thermal conductivity. In casting applications, it maintains precise temperature distribution while withstanding high thermal cycling and mechanical stress during mold operation.

Working Principle

The outer sheath functions as a protective and conductive barrier. It contains the internal heating elements while efficiently transferring heat to the casting mold surface through direct contact. The sheath maintains structural integrity under thermal expansion and contraction cycles, ensuring consistent heat transfer and preventing damage to internal components from external forces or environmental factors.

Materials

Typically manufactured from corrosion-resistant alloys such as Incoloy 800/840, stainless steel 304/316, or copper alloys. Material selection depends on operating temperature (typically 400-800°C for casting applications), corrosion resistance requirements, and thermal conductivity needs. Wall thickness ranges from 0.8-2.0mm with precise dimensional tolerances.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	100-1000mm
Voltage	110-480V
Diameter	6-25mm
Max Watt Density	40-80 W/cm²
Termination Type	Screw, Lug, or Lead Wires
Lead Configuration	Single/Dual/Triple
Operating Temperature	Up to 800°C
Sheath Material Grade	Incoloy 840/800, SS304/316

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, DIN 44870, IEC 60079

Parent Products

This component is used in the following industrial products

Casting Mold Temperature Control Cartridge Heater

Precision heating element inserted into casting molds for controlled thermal management

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Engineering Analysis

Risks & Mitigation

Thermal fatigue cracking
Corrosion from casting release agents
Electrical insulation failure
Mechanical deformation from mold clamping forces
Inconsistent heat transfer due to sheath oxidation

FMEA Triads

Trigger: Repeated thermal cycling during casting operations
Failure: Sheath material fatigue leading to cracks
Mitigation: Use alloys with better thermal fatigue resistance, implement controlled heating/cooling cycles, regular visual inspections

Trigger: Exposure to corrosive casting release agents
Failure: Pitting corrosion reducing wall thickness
Mitigation: Select corrosion-resistant materials, apply protective coatings, implement regular cleaning procedures

Trigger: Excessive mold clamping force
Failure: Sheath deformation affecting heat transfer
Mitigation: Proper heater pocket design with adequate clearance, use of support sleeves, torque-controlled installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter: ±0.05mm, Length: ±1.0mm, Straightness: 0.1mm per 100mm

Test Method

Visual inspection, dimensional verification, dielectric strength test (1500V AC for 1 minute), resistance to ground test, thermal cycling test per manufacturer specifications

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Outer Sheath

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Wrindu

Shanghai, CN

Also makes: Circuit Breaker/Switch, Portable Digital Multimeter, Surge Protection Device and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What materials are best for outer sheaths in high-temperature casting applications?

Incoloy 800/840 alloys are preferred for temperatures up to 800°C due to excellent oxidation resistance and strength retention. Stainless steel 304/316 is suitable for lower temperature applications requiring good corrosion resistance.

How does sheath thickness affect heater performance?

Thicker sheaths provide better mechanical protection but reduce heat transfer efficiency. Optimal thickness balances durability with thermal response time, typically 1.0-1.5mm for most casting applications.

Can damaged outer sheaths be repaired?

No, damaged sheaths compromise electrical safety and thermal performance. The entire cartridge heater must be replaced to maintain system integrity and prevent mold temperature inconsistencies.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Outer Sheath